Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b16523fada0508…

MALICIOUS

PDF

37.7 KB Created: 2021-05-17 04:07:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 02093a83023cb72a93672c2af94c87c1 SHA-1: ad80b39cb9bae4a573e856bdcc5f4db8ac652408 SHA-256: d3b16523fada0508676d7e5c93ee16b241bd45e571b26e3d4a36840ad68299e9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector lure, specifically advertising a "Free Robux Generator 2021 No Survey". It embeds a link to known malicious infrastructure, which is the primary indicator of malicious intent. The document body also contains explicit calls to action and the malicious URL, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-robux-generator-2021-no-survey-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003408.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3408 26420 bytes
SHA-256: 203fcefad90979de0275b818dcca411edcfb8f57215bc7fa08541ab0851936a8
font_01_sfnt_off00006fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 19044 bytes
SHA-256: 6a3befe032ce85dfab02daa9542f37d979e32cd852f1a969db8cf02301732b57

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